Camco’s Do-It-Yourself Boat Winterizer is a gravity flow system that allows you to quickly and efficiently winterize inboard/outboard marine engines. The winterizer flushes, prepares and protects your boat engine for winter storage with just five gallons of antifreeze (sold separately) and your flusher. It allows you to save time and money season after season. This kit includes an antifreeze tank with on/off valve, a ball valve, a winterizing tee and a reinforced, clear 5/8-inch hose with brass fittings. The high-flow clear hose is reinforced for improved kink resistance and the brass fittings improves the antifreeze flow to your engine.